The Blue Creature, also known as Eustace's Trumpet or The Blue Demon, is an antagonist in Courage the Cowardly Dog. It only appeared in "Perfect," in which Courage had a nightmare where he sees a freakish and whispery blue, fetus-like entity telling him that he's not perfect, the same thing that the "all-perfect" old woman that no one but Courage can see, kept repeating over and over. Courage wakes up soon afterwards. This weird creature is actually the manifestation of Eustace's broken trumpet.